cobaltaustinite, cobaltoan dolomite : Agoudal Centre Quarrys, Agoudal, Bou Azer District (Bou Azzer District), Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco — Photo: Géry PARENT · CC BY-SA 4.0
Cobaltaustinite
Cobaltaustinite is an IMA-recognized mineral species in the arsenate class, with the chemical formula CaCo(AsO₄)(OH).
It crystallizes in the orthorhombic crystal system (space group P2_12_12_1). It is a member of the Adelite structural group.
Key properties: Mohs hardness 4.5; specific gravity 4.24; Pale green streak; optically biaxial.
IMA symbol Caus, IMA status: approved, named in 1987.
A rare secondary mineral found in the oxidized zone of a copper deposit, an alteration product of arsenides.
It is found associated with Erythrite, roselite-beta, arthurite, conichalcite, chenevixite, scorodite, heterogenite.
The name refers to its content of cobalt and similarity to austinite.